The Ultimate Tree Ring Web Pages or The science of tree rings [http://web.utk.edu/~grissino/] written by Henri D. Grissino-Mayer contained an immense
number of dendro references up until August 2018 when the pages were "temporarily taken offline". Though still in March 2019 these pages could be visited through
web.archive.org (a copy of Aug 13 2018)

Henri's Supplies for Tree-Ring Research: Also these pages became blacklisted but are still partly available
through web.archive.org

The Tree-Ring Search EngingeDo publish your data at the ITRDB!
It can be of great use for other people interested in dendrochronology. My own data from the
island of Nämdö in the Stockholm archipelago is published here.
We are now a few dendro amateurs from Sweden who have published our data at the ITRDB!

The Danish oak chronology AD 200-1986 is no longer available at the homepage of the National museum in Copenhagen. Anyhow see
Cybis wiki on WestDK

Denmark and Norway:

http://natmus.dk [search for dendro] The National museum in Copenhagen: Most reports listed do not contain
ring width data, though some reports do. Though usually you will find that data as curves from which ring width data might be retrieved with the help of CooRecorder.

These pages contain some reference curves from Sweden not yet published at the ITRDB.
They are, however, easiest reached through the Scandinavian reference list at
Cybis WikiIt also contains many pictures of old Swedish barns and houses, see e.g.
Hey-barnsThere are also pictures and info of dated windmills at the Baltic island of Öland

A paper on dating certainty:Anatolian tree-ring studies are untrustworthy by Douglas Keenan.
The t-score/worst-incorrect-match-diagrams described by the author are now available within CDendro, see the menu command Settings/Enable crossdating quality test functions.